Very weird signal problems....

Hi all, tearing my hair out here and can't find an answer anywhere about my issue... Basically my. Phone displays emergency calls only,even though I have signal. My cellular data is gone. I have found that if I select 3g only my data and signal comes back and all works fine again. As soon as I select lte 4g the emergency calls only starts again and I can't use my phone. Phone was rooted and working fine. I have reset to factory settings today and then set my phone up again(which resulted in me losing all my documents and photos as I could not back it up...) problem still there though. I'm. Gutted as I've only had the phone a couple of months. Please if someone could help me out here.

Sent from my SM-G935F using Tapatalk

from xda-developers http://ift.tt/2ahk25j
via IFTTT